In a streaming processing pipeline, what is a watermark?
- A marker indicating the end of a data stream
- A mechanism for handling late data and ensuring correctness in event time processing
- A security feature for protecting data privacy
- A tool for visualizing data flow within the pipeline
In a streaming processing pipeline, a watermark is a mechanism for handling late data and ensuring correctness in event time processing. It represents a threshold that defines how far behind the event time can be considered before processing is considered complete. Watermarks are used to track the progress of event time and allow the system to determine when all relevant events for a given window have been processed, enabling accurate window-based computations in stream processing applications.
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